siemens
Siemens SENTRON 3WL ETU45B Electronic Trip Unit
Model: 3WL9111-4AA33-0AA2
4-hour response · Pricing in SAR · Delivery across all KSA regions
3WL9111-4AA33-0AA2 — Siemens SENTRON 3WL ETU45B Electronic Trip Unit
The Siemens SENTRON 3WL ETU45B is an advanced electronic trip unit that transforms the SENTRON 3WL air circuit breaker from a protection-only device into a comprehensive smart energy metering and power quality monitoring instrument. The ETU45B adds Class A power metering (IEC 61557-12), harmonic analysis up to the 31st order, power factor measurement, current and voltage asymmetry detection, and an integrated data logger to the base breaker's LSI (long-time, short-time, instantaneous) protection functions — all accessible via Modbus TCP or PROFINET communication without external current transformers or meters.
The Class A power metering accuracy of the ETU45B (voltage measurement ±0.5%, current measurement ±1% of rated) meets the IEC 62053-22 requirements for billing-grade energy measurement, allowing sub-metering at main distribution level without a separate energy meter. The harmonic analysis function measures THD and individual harmonic orders 2nd through 31st, providing the data required for IEC 61000-3-2 power quality studies at the point of common coupling in industrial and commercial installations. The integrated data logger stores up to 20,000 event records with timestamps — capturing overload events, peak demand periods, and power quality disturbances for energy management and fault investigation.
In Saudi Arabia, the 3WL ETU45B KSA is specified in smart distribution upgrade projects at SABIC petrochemical plants, SEC industrial tariff accounts, and data centres in Riyadh and Jeddah where SEC's mandatory energy auditing requirements under the Saudi Energy Efficiency Center (SEEC) programme require sub-metering at every main incomer breaker. The ETU45B's PROFINET interface integrates directly with Siemens SENTRON powerconfig and the SIMATIC Energy Suite in TIA Portal for energy management dashboards without additional gateway hardware. The retrofit capability of the ETU45B allows existing 3WL breaker populations to be upgraded to smart metering without panel replacement, which is a key cost advantage for Saudi facilities managers managing large installed bases.
Razz Middle East supplies ETU45B units as standalone retrofit upgrades and as part of new 3WL breaker assemblies, with full Modbus TCP and PROFINET configuration, SENTRON powerconfig setup, and integration to existing energy management systems.
Technical Specifications
Full specifications for the 3WL9111-4AA33-0AA2
- Metering
- Class A (IEC 61557-12) voltage ±0.5%, current ±1%
- Harmonics
- THD + 2nd–31st individual harmonic orders
- Protection
- LSI (long-time, short-time, instantaneous, ground fault)
- Communication
- Modbus TCP + PROFINET (dual protocol)
- Data Logger
- 20,000 event/measurement records
- Measurements
- P, Q, S, PF, V, I, THD, frequency, asymmetry
- Display
- LED segment on breaker front door
- Compatibility
- 3WL1, 3WL2, 3WL8 air circuit breakers
- Compliance
- IEC 61557-12 Class A, IEC 62053-22
Key Features & Benefits
- IEC 61557-12 Class A power metering accuracy (voltage ±0.5%, current ±1%) meets billing-grade sub-metering requirements, allowing the ETU45B-equipped 3WL to replace a separate revenue meter at the main distribution incomer.
- Harmonic analysis from 2nd to 31st order with THD calculation provides the data required for IEC 61000-3-2 power quality compliance studies, identifying harmonic distortion sources in VFD-dense industrial facilities.
- Integrated data logger storing 20,000 records with precise timestamps captures peak demand events, overload history, and power quality disturbances for SEEC energy audit reporting and SEC tariff dispute resolution.
- Dual Modbus TCP and PROFINET communication interfaces allow simultaneous integration with both SIMATIC Energy Suite in TIA Portal and third-party building management systems without gateway hardware.
- Retrofit installation on existing SENTRON 3WL breakers allows legacy distribution boards at Saudi petrochemical plants and commercial buildings to gain smart metering capability without panel replacement or system shutdown.
- Current and voltage asymmetry detection identifies three-phase supply unbalance conditions before they cause motor thermal damage, providing an early warning function that reduces unexpected motor failures in large Saudi industrial MCCs.
- SENTRON powerconfig and SIMATIC Energy Suite integration provides automatic energy KPI dashboards, maximum demand tracking, and CO₂ footprint calculation to support Vision 2030 energy efficiency reporting requirements.
Industrial Applications in Saudi Arabia
- Main distribution incomer sub-metering at SABIC petrochemical plant supply points in Jubail, where IEC Class A accuracy satisfies SEC's mandatory energy audit data quality requirements under the SEEC programme.
- Data centre main incomer power measurement at hyperscale and colocation facilities in Riyadh and Jeddah, where Modbus TCP integration provides PUE (Power Usage Effectiveness) data to the DCIM system.
- Smart distribution upgrade at SEC industrial tariff accounts, where the ETU45B retrofit on existing 3WL breakers delivers SEC-compliant sub-metering at every main panel without replacing the breaker or switchboard.
- Hospital main electrical distribution monitoring where continuous power quality data from the ETU45B verifies supply quality for sensitive medical imaging and life support equipment connected downstream.
- Commercial high-rise building energy management at King Abdullah Financial District (KAFD) towers, where PROFINET integration feeds the ETU45B energy data to the Siemens Desigo CC BMS for LEED energy tracking.
- Aramco industrial plant main MCC incomer metering, where peak demand data from the data logger supports energy tariff optimisation and load scheduling to reduce maximum demand charges from SEC.
- Airport and transport infrastructure power quality monitoring, where harmonic analysis from the ETU45B identifies distortion from variable speed escalators, lighting dimmers, and UPS systems for corrective capacitor filter design.
Industrial Supplier in Saudi Arabia
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